cotomi Act: Learning to Automate Work by Watching You

Masafumi Oyamada; Kunihiro Takeoka; Kosuke Akimoto; Ryoma Obara; Masafumi Enomoto; Haochen Zhang; Daichi Haraguchi; Takuya Tamura

doi:10.1145/3786335.3813203

arXiv · 2605.03231

cotomi Act: Learning to Automate Work by Watching You

Masafumi Oyamada·Kunihiro Takeoka·Kosuke Akimoto·Ryoma Obara·Masafumi Enomoto·Haochen Zhang·Daichi Haraguchi·Takuya Tamura

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Abstract

What if a browser agent could learn your work simply by watching you do it? We present cotomi Act, a browser-based computer-using agent that combines reliable multi-step task execution with persistent organizational knowledge learned from user behavior. For execution, an agent scaffold with adaptive lazy observation, verbal-diff-based history compression, coarse-grained actions, and test-time scaling via best-of-N action selection achieves 80.4% on the 179-task WebArena human-evaluation subset, exceeding the reported 78.2% human baseline. For organizational knowledge, a behavior-to-knowledge pipeline passively observes the user's browsing and progressively abstracts it into artifacts (task boards, wiki) exposed through a shared workspace editable by both user and agent. A controlled proxy evaluation confirms that task success improves as behavior-derived knowledge accumulates. In our live demonstration, attendees interact with the system in a real browser, issuing tasks and observing end-to-end autonomous execution and shared knowledge management.

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Masafumi Oyamada, Kunihiro Takeoka, Kosuke Akimoto, Ryoma Obara, Masafumi Enomoto, Haochen Zhang, Daichi Haraguchi, Takuya Tamura. 2026-05-04. cotomi Act: Learning to Automate Work by Watching You. https://doi.org/10.1145/3786335.3813203

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